I want to export a datagrid to Excel. Here is the code:

[after datagrid databind]

   Response.Clear();

       Response.Buffer = true;
       Response.AddHeader("content-disposition",
"attachment;filename=FileName.xls");
       Response.ContentType = "application/vnd.ms-excel";
       Response.Charset = "";
       Response.Cache.SetCacheability(HttpCacheability.NoCache);
       System.IO.StringWriter stringWrite = new
System.IO.StringWriter();
       System.Web.UI.HtmlTextWriter htmlWrite = new
HtmlTextWriter(stringWrite);
       DataGrid1.RenderControl(htmlWrite);
       Response.Write(stringWrite.ToString());
       Response.End();

When I open the page with Internet Explorer I get this:

Internet Explorer cannot download [file name] from [server name]
Internet Explorer was not able to open this Internet site. The
requested site is either unavailable or cannot be found. Please try
again later.

The funny thing: it works with Firefox - no problems at all.
Mime types on IIS are ok.